Silverlight don't have Enum.GetNames() method. This will be very handy method, that should go inside our utility class. So, I went ahead and created a method using reflection, code snippet below.

public class Enum<T>
{
    public static IEnumerable<string> GetNames()
    {
        var type = typeof(T);
        if (!type.IsEnum)
            throw new ArgumentException("Type '" + type.Name + "' is not an enum");

        return (
          from field in type.GetFields(System.Reflection.BindingFlags.Public 
                                       | System.Reflection.BindingFlags.Static)
          where field.IsLiteral
          select field.Name).ToList<string>();
    }
}

The static method will returns enumerable string collection. You can bind that to a listbox's itemssource. Say, like

this.listBox1.ItemSource = Enum<Colors>.GetNames();